[PATCH] Avoid additional relocations in trampoline code

[Frediano Ziglio <frediano.ziglio@cloud.com>]

The trampoline could have "manual" relocation entries (created
by assembly macros and some code to use them) and (in case of PE)
normal executable relocations.
Remove all normal executable ones. In this way we don't have to
worry about applying both correctly (they need proper order
which is hard to spot looking at the code).

Signed-off-by: Frediano Ziglio <frediano.ziglio@cloud.com>
---
 xen/arch/x86/boot/trampoline.S | 4 ++--
 xen/arch/x86/boot/wakeup.S     | 6 +++---
 xen/arch/x86/xen.lds.S         | 7 ++++++-
 3 files changed, 11 insertions(+), 6 deletions(-)

diff --git a/xen/arch/x86/boot/trampoline.S b/xen/arch/x86/boot/trampoline.S
index b8ab0ffdcb..0724c953e2 100644
--- a/xen/arch/x86/boot/trampoline.S
+++ b/xen/arch/x86/boot/trampoline.S
@@ -73,7 +73,7 @@ trampoline_protmode_entry:
         mov     %ecx,%cr4
 
         /* Load pagetable base register. */
-        mov     $sym_offs(idle_pg_table),%eax
+        mov     $idle_pg_table_pa, %eax
         add     bootsym_rel(trampoline_xen_phys_start,4,%eax)
         mov     %eax,%cr3
 
@@ -113,7 +113,7 @@ trampoline_protmode_entry:
         .code64
 start64:
         /* Jump to high mappings. */
-        movabs  $__high_start, %rdi
+        movabs  $__high_start_pa + __XEN_VIRT_START, %rdi
         jmpq    *%rdi
 
 #include "video.h"
diff --git a/xen/arch/x86/boot/wakeup.S b/xen/arch/x86/boot/wakeup.S
index 08447e1934..ebe72e1fdd 100644
--- a/xen/arch/x86/boot/wakeup.S
+++ b/xen/arch/x86/boot/wakeup.S
@@ -99,7 +99,7 @@ wakeup_32:
         mov     $bootsym_rel(wakeup_stack, 4, %esp)
 
         # check saved magic again
-        mov     $sym_offs(saved_magic),%eax
+        mov     $saved_magic_pa, %eax
         add     bootsym_rel(trampoline_xen_phys_start, 4, %eax)
         mov     (%eax), %eax
         cmp     $0x9abcdef0, %eax
@@ -112,7 +112,7 @@ wakeup_32:
         mov     %ecx, %cr4
 
         /* Load pagetable base register */
-        mov     $sym_offs(idle_pg_table),%eax
+        mov     $idle_pg_table_pa ,%eax
         add     bootsym_rel(trampoline_xen_phys_start,4,%eax)
         mov     %eax,%cr3
 
@@ -156,7 +156,7 @@ wakeup_32:
         .code64
 wakeup_64:
         /* Jump to high mappings and the higher-level wakeup code. */
-        movabs  $s3_resume, %rbx
+        movabs  $s3_resume_pa + __XEN_VIRT_START, %rbx
         jmp     *%rbx
 
 bogus_saved_magic:
diff --git a/xen/arch/x86/xen.lds.S b/xen/arch/x86/xen.lds.S
index 9a1dfe1b34..8e604dde48 100644
--- a/xen/arch/x86/xen.lds.S
+++ b/xen/arch/x86/xen.lds.S
@@ -71,7 +71,12 @@ SECTIONS
   __2M_text_start = .;         /* Start of 2M superpages, mapped RX. */
 #endif
 
-  start_pa = ABSOLUTE(start - __XEN_VIRT_START);
+#define DEFINE_PA_ADDRESS(sym) sym ## _pa = ABSOLUTE(sym - __XEN_VIRT_START)
+  DEFINE_PA_ADDRESS(start);
+  DEFINE_PA_ADDRESS(saved_magic);
+  DEFINE_PA_ADDRESS(idle_pg_table);
+  DEFINE_PA_ADDRESS(__high_start);
+  DEFINE_PA_ADDRESS(s3_resume);
 
   . = __XEN_VIRT_START + XEN_IMG_OFFSET;
   _start = .;
-- 
2.46.0